ABAP Select data from SAP table MSQVTLFLS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MSQVTLFLS table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to MSQVTLFLS. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the MSQVTLFLS table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_MSQVTLFLS TYPE STANDARD TABLE OF MSQVTLFLS,
      WA_MSQVTLFLS TYPE MSQVTLFLS,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <MSQVTLFLS> TYPE MSQVTLFLS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MSQVTLFLS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MSQVTLFLS
  INTO TABLE IT_MSQVTLFLS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSQVTLFLS
*  INTO TABLE @DATA(IT_MSQVTLFLS2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_MSQVTLFLS INDEX 1 INTO DATA(WA_MSQVTLFLS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MSQVTLFLS ASSIGNING <MSQVTLFLS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSQVTLFLS>-DBNAME = 1.
<MSQVTLFLS>-FILENAME = 1.
<MSQVTLFLS>-TIMESTAMP = 1.
<MSQVTLFLS>-IOSTALLMS = 1.
<MSQVTLFLS>-IOSTALLRDMS = 1.

ENDLOOP.

LOOP AT IT_MSQVTLFLS INTO WA_MSQVTLFLS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSQVTLFLS-IOSTALLWRMS, sy-vline,
  WA_MSQVTLFLS-KBREADSEC, sy-vline,
  WA_MSQVTLFLS-KBWRTSEC, sy-vline,
  WA_MSQVTLFLS-NUMREADS, sy-vline,
  WA_MSQVTLFLS-NUMWRITES, sy-vline,
  WA_MSQVTLFLS-BYTESREAD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSQVTLFLS you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_MSQVTLFLS TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_MSQVTLFLS INTO WA_MSQVTLFLS.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MSQVTLFLS_STR, 
DBNAME TYPE STRING,
FILENAME TYPE STRING,
TIMESTAMP TYPE STRING,
IOSTALLMS TYPE STRING,
IOSTALLRDMS TYPE STRING,
IOSTALLWRMS TYPE STRING,
KBREADSEC TYPE STRING,
KBWRTSEC TYPE STRING,
NUMREADS TYPE STRING,
NUMWRITES TYPE STRING,
BYTESREAD TYPE STRING,
BYTESWTN TYPE STRING,
KBREADREQ TYPE STRING,
KBWRTREQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSQVTLFLS_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_MSQVTLFLS_STR-DBNAME sy-vline 
WA_MSQVTLFLS_STR-FILENAME sy-vline 
WA_MSQVTLFLS_STR-TIMESTAMP sy-vline 
WA_MSQVTLFLS_STR-IOSTALLMS sy-vline 
WA_MSQVTLFLS_STR-IOSTALLRDMS sy-vline 
WA_MSQVTLFLS_STR-IOSTALLWRMS sy-vline 
WA_MSQVTLFLS_STR-KBREADSEC sy-vline 
WA_MSQVTLFLS_STR-KBWRTSEC sy-vline 
WA_MSQVTLFLS_STR-NUMREADS sy-vline 
WA_MSQVTLFLS_STR-NUMWRITES sy-vline 
WA_MSQVTLFLS_STR-BYTESREAD sy-vline 
WA_MSQVTLFLS_STR-BYTESWTN sy-vline 
WA_MSQVTLFLS_STR-KBREADREQ sy-vline 
WA_MSQVTLFLS_STR-KBWRTREQ sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.